Research On Treatment Of Printing And Dyeing Wastewater By The Micro-electrolysis-Fenton-SBR Process

Complex indigo denim dyeing wastewater component，chroma，large amount of salt ismore difficult to deal with wastewater in the dyeing wastewater；untreated or dealing withcompliance on direct emissions，will seriously contaminate surface or groundwaterresources；micro-electrolysis by Fenton-SBR process this kind of industrial wastewatertreatment efficiency，small footprint，simple，operation，low processing costs，and byWaste advantages.Subject to the iron-carbon micro-electrolysis Fenton pretreatment， thedepth of the SBR deal with indigo denim dyeing wastewater， COD iron-carbonmicro-electrolysis-Fenton reagent system to study the treatment effects and related factors forthe target pollutants，the purpose of iron-carbon micro-electrolysis technology with Fentonreagent to play micro-electrolysis reaction the role of Fe²⁺，to promote the generation of OH，lower cost to overcome the Fenton reaction to deal with the shortcomings of high cost，serious waste of oxidant, and then SBR depth processing of indigo denim dyeingwastewater to reach the national discharge standard，the micro-electrolysis-Fenton-SBRindigo denim dyeing wastewater practical application to provide a reference.The mainconclusions are as follows:（1） using the method of orthogonal test and univariate analysis test analysis of theobtained micro-electrolytic treatment of dyeing wastewater treatment process conditions wereas follows：pH value，the iron-carbon mass ratio2:1，reaction time90min；the test datapolynomial fitting to get the micro-electrolytic degradation of dying wastewater theCOD_cr the equation:1/ct-1/c0=4×10^-6t+4x10^-4（c0，ctinitial wastewater of COD, t minwastewater COD t is the reaction time），the correlation coefficient R²=0.9663，themicro-electrolytic processing of indigo denim dyeing wastewater COD degra dationreaction issecond order kinetics.（2） orthogonal and single factor experiments to determine the optimum operatingconditions of the micro-electrolysis-Fenton reaction. The results show that: micro-electrolysis water at pH5，H₂O₂dosage for60min under the conditions of3‰，COD removal up to84.1%color removal rate of90%，the ratio of BOD₅/COD ratio rose to0.525；combination ofiron-carbon micro-electrolysis-Fenton process the COD removal efficiency of87.26%.（3） examine the aeration time，the operation mode and the initial pH value on the effectof SBR depth treatment of printing and dyeing wastewater of indigo denimmicro-electrolysis-Fenton effluent.The experimental results show that： by SBR depthprocessing of micro-electrolysis-Fenton indigo denim dyeing wastewater effluent aerationtime is10hours, hypoxia for4h；the best operating mode for the three sections of the A/Otype，COD removal rate of96%，98%color removal；optimum pH value of7，the effluentCOD is51.2mg/L，the removal rate of96%, water color40times，the removal rate of98%；to be stable to achieve a standard of the national pollutant discharge standards.